Opknap-verslag Graupner Cirrus (film eerste vlucht pagina 3)

@Wubbe: die vrees had ik ook. Deze romp heb ik ruim 20 minuten op een loeihete radiator gelegd. Het woord zacht wil ik niet gebruiken maar de flexibiliteit nam danig toe! Het is gelukt om de romp te reponeren over de neutraalstand. Daarna kwam hij terug in de neutraalstand. Het is niet uit te sluiten dat dit proces nog een keer herhaald moet worden. Zoals het er nu naar uitziet heb ik er wel vertrouwen in. In ieder geval vooralsnog geen noodzaak voor drastische ingrepen!! :mrgreen::mrgreen:
Tijd zal het leren :D


Groeten, Maarten
 
ik durfde al niet vragen "ga je dit met de föhn verwarmen?"
hehe :p
 
Electro Cirrus Build

I started construction of the Cirrus. The forward fuselage is almost finished. I still need to make more room for the motor wires and add a platform for the battery. In the rear I need to add the linkage for the stabilizer and build the fin and rudder.

I sanded away most of the two forward formers to make room for the electronics. The servos are installed now, as it will be very difficult later.

Here is the fuselage ready for glue. I took the photo because I used CA glue. I did not know if I could apply the glue and get the fuselage together fast enough.
readyforglue.jpg



I cut out a cooling vent similar to the one Arjan put on his Cirrus.

airvent.jpg



It worked. Here the fuselage halves are glued together. Carbon fiber was added to the formers to add strength, and the firewall installed.

fusehalvesglued.jpg


Here is the fuselage as I left it tonight. Everything is sanded. The canopy is glued to the frame.

cirrusfuselage.jpg



Tomorrow I finish mounting the motor, and work on the tail.

Roger
 
Glider Nose Collection

For fun I found the noses from my other electro gliders. Here is a photo of all three. From left to right: Multiplex Flamingo, Faactor, Cirrus.

noses.jpg


Roger
 
Hello Roger,

Nice to see the old ABS fuselage getting back to life. Last Year I build another old Graupner Glider, the Junior Sport which also features an ABS fuselage. I F/G'd the inside of that fuselage from the nose to the wings with carbon / epoxy. It is now very solid. Are you considering strengthening the fuselage in any way? As you know ABS tends to get brittle over time and with low temperatures. I confidently fly my Junior Sport also with low temps.

I read that you are installing ailerons. Are the installed servo's for central located linkage? I was curious wat kind of linkage you will be using, ball links might be easier to connect / disconnect.

Just installed the bellcrank in my Cirrus and made a rudder from a drawing that was sent to me by Madduc. The replacement expoxy fuse was bent but remains straight after correction. Will post some pics later.

Your addition to this thread is surely appreciated and will be followed.

Greetings, Maarten
 
The canopy attachment is finished. I used a small steel pin in the front held down by some scrap plastic.

canopypin.jpg


For the rear I attached strips of metal cut from a can, and two magnets.
canopymount.jpg


I also added a small piece of plastic to keep the canopy from moving.

canopymountfromoutside.jpg


The fin and rudder are complete, and the rudder and elevator linkages finished.

The rudder in the photo below is not yet hinged. It is just being held on loosely with tape so I can adjust the linkage. I planned to build a full flying rudder, but decided to go with the traditional construction.

rudder.jpg



Hello Maartin, I added some carbon/CA reinforcement below the wing. I have not yet added reinforcement to the cockpit area, although I believe it will need some.

I plan to use separate servos for each aileron. This is easy to do while building the wing.

I also plan to use spoilers with with separate 5g servos. On landing the Cirrus seems to float forever less than a meter from the ground. I need the spoilers to be able to make the landing spot.

I finished the one of the elevators yesterday. I hope to do the second one tonight. The it is on to the wings.

In case anyone is interested, I am building this Cirrus with the same plans I used to build two others almost 30 years ago. The plans from this kit are in new condition and carefully stored.

Roger
 
Hello Roger, nice to see you are moving along.
Like yourself, I at first planned on installing a full flying rudder. I even have the original hinge from the Cumulus 2800 to attach the rudder to the fuselage. Instead, I opted for the traditional rudder.
With the bellcrank installed and the rudder I made it looks like this

full


full
 
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Mooi rood is niet lelijk... ik vindt het wel wat hebben hoor zo in een 'andere kleur'. De mijne is helemaal blauw, misstaat ook niet (wit ook niet trouwens).
 
mooie autos heb je ook vaak in de uiteenlopenste kleuren, en toch blijven ze mooi en speciaal :)
 
Roger,

Without trying to sound like a knowitall I would kindly suggest to reinforce the cockpit area with F/G. I'm sure it will keep the fuselage intact in case of accidental harsher contact with the ground. It would be a shame of all the hard work to omit reinforcement but that's just my to cents to this subject.

Regards Maarten

@Madduc: ben benieuwd hoe 'ie vliegt. Nog een weekje!
 
Jakkie takkie zei:
Mooi rood is niet lelijk... ik vindt het wel wat hebben hoor zo in een 'andere kleur'. De mijne is helemaal blauw, misstaat ook niet (wit ook niet trouwens).
Klik om te vergroten...

In het echt is ie minder mooi hoor, gewoon lekker in de lucht bekijken dan ziet het er goed uit. Ik heb deze Cirrus van een oude man over genomen die de Cirrus met een kus op de neus overhandigde. Hij heeft er veel wedstrijden (LSF?) mee gevlogen. Er zit een extra set vleugels bij met een dubbele knik om minder hoogte te verliezen in de bochten blijkbaar.

Vooralsnog alleen de electronica geinstalleerd en geen restauratiewerk aangevangen. Ook wel eens lekker om een kist te hebben om gelijk mee te vliegen. Op zich verdient ze wel een restauratie, maar geen idee of ik dat nog ga doen, eerst maar eens vliegen.

Vanmiddag even met Harry op het industrieterrein van Heteren geweest waar we een prachtig veld hebben. Het was een beetje vochtig en mistig, maar de Cirrus moet haar maiden krijgen. Zover is het helaas niet gekomen. Na meerdere handstartjes en aanpassen ZP vloog de Cirrus echt heel erg mooi. Ver het veld over en netjes geland.......maar bij de landing zag ik ineens een boeggolf omhoog komen. :shock:

Snel ernaar toe, en ja hoor, op dat gedeelte van het veld stond zo'n 5cm water. :oops: Dat konden wij niet zien vanwaar wij de Cirrus opgooiden, en ze zweeft zo mooi lang door.......

Anyway, kap open, water eruit, stroom eraf en tja, dan de reeds uitgelegde hoogstartlijn maar weer oprollen en naar huis. De electronica ligt nu te drogen, maar dat komt wel goed. De Cirrus zweeft heel mooi, kan niet wachten om haar aan de hoogstart te hangen.

Zondag gaat ze natuurlijk mee naar het VGG treffen.
 
Maarten, Thanks for the good suggestion. I glued a battery holder in place on the cockpit floor, before we started discussing reinforcement. I guess I will just have to pry it out, put down something to strengthen the plastic, then put a new battery holder in place. It is much easier to rebuild a balsa piece, than to rebuild the front fuselage.

The stabilizers are finished except for covering. The wings are next. We just got 66cm of snow, so I spent a good part of yesterday and today digging out. When the roads are clear, I will go to the hardware store and get a building board for the wings.

MadDuc, I think you may need to put floats on your Cirrus.
icon12.gif
I am glad that you got it back OK.

Roger
 
Maguro zei:
MadDuc, I think you may need to put floats on your Cirrus.
icon12.gif
I am glad that you got it back OK.

Roger
Klik om te vergroten...

:mrgreen: On the other side of the field is a pond. When I was flying there with one of my sons yesterday, he said it would have been great to have floats and land the Easystar on the water instead of the grass....... I guess I did just that today, but without floats and on a place where we didn't expect water......

Anyway, another 2-3 days and she should be back in the air.

Good luck with finishing your Cirrus Roger!
 
zwever met drijvers

MadDuc zei:
:mrgreen: On the other side of the field is a pond. When I was flying there with one of my sons yesterday, he said it would have been great to have floats and land the Easystar on the water instead of the grass....... I guess I did just that today, but without floats and on a place where we didn't expect water......
Anyway, another 2-3 days and she should be back in the air.
Good luck with finishing your Cirrus Roger!
Klik om te vergroten...

Volgens mij vroeg Fotor(Raymond) vorige week wie er drijvers onder z'n zwever wilde zetten....dan kon hij met zijn sleper(zie sleepdraadje Mentor) vanaf het water starten(dit was natuurlijk een grapje)
Hij had een vooruitziende blik
 
I realize that products differ from one country to the next, but the categories of products such as CA glue or epoxy are usually available in most places. The reason I am saying this is that I am looking for a product to fill in the seams in the Cirrus fuselage. I am concerned that most products may weaken the plastic. Also can automotive primer be used to prepare the fuselage for paint, or will the solvents weaken the plastic.

I solved these problems 30 years ago. Now I can't remember what I did.

Thanks for your help.

Roger
 
Hello Roger, to fill the seams I would use epoxy with micro balloons.
This mix will not affect the ABS plastic and lends itself for sanding very well. As an alternative you kan use putty used for static plastic models.
With a credit card you kan fill the seams neatly without much use for sanding.

Automotive primer contains agressive solvents that will affect the plastic.
For primer you can safely use any universal primer that is based on alkyd resin. I should know because I used to sell this stuff. This can be used for a spray gun after dilution with white spirit
This is the kind of primer that you can buy at any paint and hardware store.

Maarten
 
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